Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. toaster611
39
00:02.43
2. A2Ragnell
16
00:02.60
3. DrVince
51
00:03.35
4. xXEZXx 00:03.50
5. Truth-or-Peace
37
00:03.54
6. haramey
31
00:03.86
7. ziairdis 00:04.11
8. Solander 00:04.21
9. Eli Seeliger
9
00:04.26
10. kushisthebush
4
00:04.32
11. botticus 00:04.61
12. ThePipeline
45
00:05.24
13. garbage
125
00:05.33
14. Hargaz
10
00:05.50
15. eonhochang
34
00:05.74
16. Hanou
12
00:05.85
17. Sombro64 00:05.93
18. boop
33
00:06.82
19. TheBigMD
68
00:06.92
20. Todiho 00:07.19
This Week
1. toaster611
39
00:02.43
2. DrVince
51
00:03.35
3. xXEZXx 00:03.50
4. Solander 00:04.21
5. Eli Seeliger
9
00:04.26
6. kushisthebush
4
00:04.32
7. Hargaz
10
00:05.50
8. eonhochang
34
00:05.92
9. 火星萝卜
11
00:07.19
10. Core7Beasty 00:07.21
11. s56squared 00:08.11
12. Sombro64 00:08.49
13. Dorice
154
00:08.51
14. concentration 00:10.88
15. medusaworm 00:11.86
16. ChiefOsceola 00:14.13
17. M.A. F.H.
1
00:15.49
18. Aishwarya
11
00:16.05
19. Evan12345 00:16.09
20. Mitsunari
7
00:17.25
Today
1. eonhochang
34
00:12.73
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MO3
1. Douglas Shamlin Jr.
444
00:01.68
2. sfumato
161
00:01.78
3. vowels
175
00:01.90
4. BingBongBob
88
00:02.00
5. bearn
133
00:02.03
6. nabifan
74
00:02.09
7. jai22933
21
00:02.24
8. IHNN1
11
00:02.28
9. mediteran13
54
00:02.46
10. jaybrainer
103
00:02.47
AO5
1. Douglas Shamlin Jr.
444
00:01.71
2. sfumato
161
00:01.89
3. vowels
175
00:01.96
4. nabifan
74
00:02.09
5. bearn
133
00:02.10
6. IHNN1
11
00:02.36
6. jai22933
21
00:02.36
8. BingBongBob
88
00:02.41
9. jaybrainer
103
00:02.44
10. mediteran13
54
00:02.50
AO12
1. Douglas Shamlin Jr.
444
00:01.87
2. vowels
175
00:02.15
3. sfumato
161
00:02.29
4. bearn
133
00:02.35
5. nabifan
74
00:02.45
6. BingBongBob
88
00:02.73
7. jaybrainer
103
00:02.88
8. jai22933
21
00:02.92
9. IHNN1
11
00:02.94
10. mediteran13
54
00:03.08
Robots / programmatic solversinfo  
1.nbjohnson00:00.407
2.Charlie Li
60
00:00.420
3.mediteran13
54
00:03.440

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2023-01-28 06:38:14

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